2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
4 * Copyright (c) 1991, 1993
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7 * This code is derived from software contributed to Berkeley by
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)vm_map.h 8.9 (Berkeley) 5/17/95
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
42 * Permission to use, copy, modify and distribute this software and
43 * its documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
52 * Carnegie Mellon requests users of this software to return to
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
66 * Virtual memory map module definitions.
73 #include <sys/_mutex.h>
78 * vm_map_t the high-level address map data structure.
79 * vm_map_entry_t an entry in an address map.
82 typedef u_char vm_flags_t;
83 typedef u_int vm_eflags_t;
86 * Objects which live in maps may be either VM objects, or
87 * another map (called a "sharing map") which denotes read-write
88 * sharing with other maps.
91 struct vm_object *vm_object; /* object object */
92 struct vm_map *sub_map; /* belongs to another map */
96 * Address map entries consist of start and end addresses,
97 * a VM object (or sharing map) and offset into that object,
98 * and user-exported inheritance and protection information.
99 * Also included is control information for virtual copy operations.
101 struct vm_map_entry {
102 struct vm_map_entry *prev; /* previous entry */
103 struct vm_map_entry *next; /* next entry */
104 struct vm_map_entry *left; /* left child in binary search tree */
105 struct vm_map_entry *right; /* right child in binary search tree */
106 vm_offset_t start; /* start address */
107 vm_offset_t end; /* end address */
108 vm_offset_t next_read; /* vaddr of the next sequential read */
109 vm_size_t max_free; /* max free space in subtree */
110 union vm_map_object object; /* object I point to */
111 vm_ooffset_t offset; /* offset into object */
112 vm_eflags_t eflags; /* map entry flags */
113 vm_prot_t protection; /* protection code */
114 vm_prot_t max_protection; /* maximum protection */
115 vm_inherit_t inheritance; /* inheritance */
116 uint8_t read_ahead; /* pages in the read-ahead window */
117 int wired_count; /* can be paged if = 0 */
118 struct ucred *cred; /* tmp storage for creator ref */
119 struct thread *wiring_thread;
122 #define MAP_ENTRY_NOSYNC 0x00000001
123 #define MAP_ENTRY_IS_SUB_MAP 0x00000002
124 #define MAP_ENTRY_COW 0x00000004
125 #define MAP_ENTRY_NEEDS_COPY 0x00000008
126 #define MAP_ENTRY_NOFAULT 0x00000010
127 #define MAP_ENTRY_USER_WIRED 0x00000020
129 #define MAP_ENTRY_BEHAV_NORMAL 0x00000000 /* default behavior */
130 #define MAP_ENTRY_BEHAV_SEQUENTIAL 0x00000040 /* expect sequential
132 #define MAP_ENTRY_BEHAV_RANDOM 0x00000080 /* expect random
134 #define MAP_ENTRY_BEHAV_RESERVED 0x000000c0 /* future use */
135 #define MAP_ENTRY_BEHAV_MASK 0x000000c0
136 #define MAP_ENTRY_IN_TRANSITION 0x00000100 /* entry being
138 #define MAP_ENTRY_NEEDS_WAKEUP 0x00000200 /* waiters in
140 #define MAP_ENTRY_NOCOREDUMP 0x00000400 /* don't include in
142 #define MAP_ENTRY_VN_EXEC 0x00000800 /* text vnode mapping */
143 #define MAP_ENTRY_GROWS_DOWN 0x00001000 /* top-down stacks */
144 #define MAP_ENTRY_GROWS_UP 0x00002000 /* bottom-up stacks */
146 #define MAP_ENTRY_WIRE_SKIPPED 0x00004000
147 #define MAP_ENTRY_VN_WRITECNT 0x00008000 /* writeable vnode
149 #define MAP_ENTRY_GUARD 0x00010000
150 #define MAP_ENTRY_STACK_GAP_DN 0x00020000
151 #define MAP_ENTRY_STACK_GAP_UP 0x00040000
152 #define MAP_ENTRY_HEADER 0x00080000
155 static __inline u_char
156 vm_map_entry_behavior(vm_map_entry_t entry)
158 return (entry->eflags & MAP_ENTRY_BEHAV_MASK);
162 vm_map_entry_user_wired_count(vm_map_entry_t entry)
164 if (entry->eflags & MAP_ENTRY_USER_WIRED)
170 vm_map_entry_system_wired_count(vm_map_entry_t entry)
172 return (entry->wired_count - vm_map_entry_user_wired_count(entry));
177 * A map is a set of map entries. These map entries are
178 * organized both as a binary search tree and as a doubly-linked
179 * list. Both structures are ordered based upon the start and
180 * end addresses contained within each map entry.
182 * Sleator and Tarjan's top-down splay algorithm is employed to
183 * control height imbalance in the binary search tree.
185 * The map's min offset value is stored in map->header.end, and
186 * its max offset value is stored in map->header.start. These
187 * values act as sentinels for any forward or backward address
188 * scan of the list. The map header has a special value for the
189 * eflags field, MAP_ENTRY_HEADER, that is set initially, is
190 * never changed, and prevents an eflags match of the header
191 * with any other map entry.
194 * (c) const until freed
197 struct vm_map_entry header; /* List of entries */
198 struct sx lock; /* Lock for map data */
199 struct mtx system_mtx;
200 int nentries; /* Number of entries */
201 vm_size_t size; /* virtual size */
202 u_int timestamp; /* Version number */
204 u_char system_map; /* (c) Am I a system map? */
205 vm_flags_t flags; /* flags for this vm_map */
206 vm_map_entry_t root; /* Root of a binary search tree */
207 pmap_t pmap; /* (c) Physical map */
208 vm_offset_t anon_loc;
215 #define MAP_WIREFUTURE 0x01 /* wire all future pages */
216 #define MAP_BUSY_WAKEUP 0x02
217 #define MAP_IS_SUB_MAP 0x04 /* has parent */
218 #define MAP_ASLR 0x08 /* enabled ASLR */
219 #define MAP_ASLR_IGNSTART 0x10
222 #if defined(KLD_MODULE) && !defined(KLD_TIED)
223 #define vm_map_max(map) vm_map_max_KBI((map))
224 #define vm_map_min(map) vm_map_min_KBI((map))
225 #define vm_map_pmap(map) vm_map_pmap_KBI((map))
227 static __inline vm_offset_t
228 vm_map_max(const struct vm_map *map)
231 return (map->header.start);
234 static __inline vm_offset_t
235 vm_map_min(const struct vm_map *map)
238 return (map->header.end);
241 static __inline pmap_t
242 vm_map_pmap(vm_map_t map)
248 vm_map_modflags(vm_map_t map, vm_flags_t set, vm_flags_t clear)
250 map->flags = (map->flags | set) & ~clear;
252 #endif /* KLD_MODULE */
256 * Shareable process virtual address space.
259 * (c) const until freed
262 struct vm_map vm_map; /* VM address map */
263 struct shmmap_state *vm_shm; /* SYS5 shared memory private data XXX */
264 segsz_t vm_swrss; /* resident set size before last swap */
265 segsz_t vm_tsize; /* text size (pages) XXX */
266 segsz_t vm_dsize; /* data size (pages) XXX */
267 segsz_t vm_ssize; /* stack size (pages) */
268 caddr_t vm_taddr; /* (c) user virtual address of text */
269 caddr_t vm_daddr; /* (c) user virtual address of data */
270 caddr_t vm_maxsaddr; /* user VA at max stack growth */
271 volatile int vm_refcnt; /* number of references */
273 * Keep the PMAP last, so that CPU-specific variations of that
274 * structure on a single architecture don't result in offset
275 * variations of the machine-independent fields in the vmspace.
277 struct pmap vm_pmap; /* private physical map */
281 static __inline pmap_t
282 vmspace_pmap(struct vmspace *vmspace)
284 return &vmspace->vm_pmap;
290 * Macros: vm_map_lock, etc.
292 * Perform locking on the data portion of a map. Note that
293 * these macros mimic procedure calls returning void. The
294 * semicolon is supplied by the user of these macros, not
295 * by the macros themselves. The macros can safely be used
296 * as unbraced elements in a higher level statement.
299 void _vm_map_lock(vm_map_t map, const char *file, int line);
300 void _vm_map_unlock(vm_map_t map, const char *file, int line);
301 int _vm_map_unlock_and_wait(vm_map_t map, int timo, const char *file, int line);
302 void _vm_map_lock_read(vm_map_t map, const char *file, int line);
303 void _vm_map_unlock_read(vm_map_t map, const char *file, int line);
304 int _vm_map_trylock(vm_map_t map, const char *file, int line);
305 int _vm_map_trylock_read(vm_map_t map, const char *file, int line);
306 int _vm_map_lock_upgrade(vm_map_t map, const char *file, int line);
307 void _vm_map_lock_downgrade(vm_map_t map, const char *file, int line);
308 int vm_map_locked(vm_map_t map);
309 void vm_map_wakeup(vm_map_t map);
310 void vm_map_busy(vm_map_t map);
311 void vm_map_unbusy(vm_map_t map);
312 void vm_map_wait_busy(vm_map_t map);
313 vm_offset_t vm_map_max_KBI(const struct vm_map *map);
314 vm_offset_t vm_map_min_KBI(const struct vm_map *map);
315 pmap_t vm_map_pmap_KBI(vm_map_t map);
317 #define vm_map_lock(map) _vm_map_lock(map, LOCK_FILE, LOCK_LINE)
318 #define vm_map_unlock(map) _vm_map_unlock(map, LOCK_FILE, LOCK_LINE)
319 #define vm_map_unlock_and_wait(map, timo) \
320 _vm_map_unlock_and_wait(map, timo, LOCK_FILE, LOCK_LINE)
321 #define vm_map_lock_read(map) _vm_map_lock_read(map, LOCK_FILE, LOCK_LINE)
322 #define vm_map_unlock_read(map) _vm_map_unlock_read(map, LOCK_FILE, LOCK_LINE)
323 #define vm_map_trylock(map) _vm_map_trylock(map, LOCK_FILE, LOCK_LINE)
324 #define vm_map_trylock_read(map) \
325 _vm_map_trylock_read(map, LOCK_FILE, LOCK_LINE)
326 #define vm_map_lock_upgrade(map) \
327 _vm_map_lock_upgrade(map, LOCK_FILE, LOCK_LINE)
328 #define vm_map_lock_downgrade(map) \
329 _vm_map_lock_downgrade(map, LOCK_FILE, LOCK_LINE)
331 long vmspace_resident_count(struct vmspace *vmspace);
335 /* XXX: number of kernel maps to statically allocate */
339 * Copy-on-write flags for vm_map operations
341 #define MAP_INHERIT_SHARE 0x00000001
342 #define MAP_COPY_ON_WRITE 0x00000002
343 #define MAP_NOFAULT 0x00000004
344 #define MAP_PREFAULT 0x00000008
345 #define MAP_PREFAULT_PARTIAL 0x00000010
346 #define MAP_DISABLE_SYNCER 0x00000020
347 #define MAP_CHECK_EXCL 0x00000040
348 #define MAP_CREATE_GUARD 0x00000080
349 #define MAP_DISABLE_COREDUMP 0x00000100
350 #define MAP_PREFAULT_MADVISE 0x00000200 /* from (user) madvise request */
351 #define MAP_VN_WRITECOUNT 0x00000400
352 #define MAP_REMAP 0x00000800
353 #define MAP_STACK_GROWS_DOWN 0x00001000
354 #define MAP_STACK_GROWS_UP 0x00002000
355 #define MAP_ACC_CHARGED 0x00004000
356 #define MAP_ACC_NO_CHARGE 0x00008000
357 #define MAP_CREATE_STACK_GAP_UP 0x00010000
358 #define MAP_CREATE_STACK_GAP_DN 0x00020000
359 #define MAP_VN_EXEC 0x00040000
362 * vm_fault option flags
364 #define VM_FAULT_NORMAL 0 /* Nothing special */
365 #define VM_FAULT_WIRE 1 /* Wire the mapped page */
366 #define VM_FAULT_DIRTY 2 /* Dirty the page; use w/VM_PROT_COPY */
369 * Initially, mappings are slightly sequential. The maximum window size must
370 * account for the map entry's "read_ahead" field being defined as an uint8_t.
372 #define VM_FAULT_READ_AHEAD_MIN 7
373 #define VM_FAULT_READ_AHEAD_INIT 15
374 #define VM_FAULT_READ_AHEAD_MAX min(atop(MAXPHYS) - 1, UINT8_MAX)
377 * The following "find_space" options are supported by vm_map_find().
379 * For VMFS_ALIGNED_SPACE, the desired alignment is specified to
380 * the macro argument as log base 2 of the desired alignment.
382 #define VMFS_NO_SPACE 0 /* don't find; use the given range */
383 #define VMFS_ANY_SPACE 1 /* find a range with any alignment */
384 #define VMFS_OPTIMAL_SPACE 2 /* find a range with optimal alignment*/
385 #define VMFS_SUPER_SPACE 3 /* find a superpage-aligned range */
386 #define VMFS_ALIGNED_SPACE(x) ((x) << 8) /* find a range with fixed alignment */
389 * vm_map_wire and vm_map_unwire option flags
391 #define VM_MAP_WIRE_SYSTEM 0 /* wiring in a kernel map */
392 #define VM_MAP_WIRE_USER 1 /* wiring in a user map */
394 #define VM_MAP_WIRE_NOHOLES 0 /* region must not have holes */
395 #define VM_MAP_WIRE_HOLESOK 2 /* region may have holes */
397 #define VM_MAP_WIRE_WRITE 4 /* Validate writable. */
400 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
401 vm_map_t vm_map_create(pmap_t, vm_offset_t, vm_offset_t);
402 int vm_map_delete(vm_map_t, vm_offset_t, vm_offset_t);
403 int vm_map_find(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t,
404 vm_offset_t, int, vm_prot_t, vm_prot_t, int);
405 int vm_map_find_min(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *,
406 vm_size_t, vm_offset_t, vm_offset_t, int, vm_prot_t, vm_prot_t, int);
407 int vm_map_fixed(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_size_t,
408 vm_prot_t, vm_prot_t, int);
409 vm_offset_t vm_map_findspace(vm_map_t, vm_offset_t, vm_size_t);
410 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
411 void vm_map_init(vm_map_t, pmap_t, vm_offset_t, vm_offset_t);
412 int vm_map_insert (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int);
413 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
414 vm_pindex_t *, vm_prot_t *, boolean_t *);
415 int vm_map_lookup_locked(vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
416 vm_pindex_t *, vm_prot_t *, boolean_t *);
417 void vm_map_lookup_done (vm_map_t, vm_map_entry_t);
418 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
419 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
420 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
421 void vm_map_simplify_entry(vm_map_t map, vm_map_entry_t entry);
422 void vm_map_startup (void);
423 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
424 int vm_map_sync(vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
425 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int);
426 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
427 int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
429 int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags);
430 int vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end,
432 long vmspace_swap_count(struct vmspace *vmspace);
433 void vm_map_entry_set_vnode_text(vm_map_entry_t entry, bool add);
435 #endif /* _VM_MAP_ */